theatrical vs theater

theatrical and theater both are nouns.

Word	Noun	Adjective	Verb	Adverb
theatrical	Yes	Yes	No	No
theater	Yes	No	No	No

theatrical (noun)	theater (noun)
a performance of a play	a building where theatrical performances or motion-picture shows can be presented
	the art of writing and producing plays
	a region in which active military operations are in progress

theatrical (adjective)	theater (adjective)
suited to or characteristic of the stage or theater
of or relating to the theater